Labor Posters

After recently filing my LLC, I received a letter in the mail from a company called Labor Poster Compliance stating that I need to have labor law posters posted in my work space. I am a single member LLC and do not have any employees (besides myself, but I will not be treating myself as an employee of the LLC since I am the owner). The letter said to obtain my state and federal labor law posters, I’d have to pay the company $86.25 for them. This smells like a scam to me, but I wanted to ask — is any of this legitimate? Do I need to buy specific posters from a company? Thank you!